Rotating speed measuring apparatus having a corrector for low and high speeds using angle and frequency transducers
US4808933A · kind A · utility
7Cited by
5References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1987 |
| Grant date | Feb 28, 1989 |
| Priority date | — |
| Expiry date | Feb 11, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/46
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A signal whose frequency is proportional to a rotational speed of a rotor and whose rising and falling angles near points crossing zero becomes larger with the rotational speed of the rotor is used to produce a first signal of amplitude corresponding to the rising and falling angles and a second signal of amplitude corresponding to the frequency, a difference between the first and second signals is evaluated, and the first or second signals are corrected with the difference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.